🚀 go-pugleaf

In lieu of a schematic, it sounds as simple as no high voltage, not video.
Tube testers are virtually worthless, and voltage readings on tube pins are
not much help (if you had a scope AND knew what the waveforms were supposed
to be, this could be a different story).

Anyway, replace the horizontal oscillator first. Still doesn't work?
Replace the horizontal output AND the damper. Still doesn't work?
Check the horizontal/flyback area for open resistors and shorted caps.
Real simple troubleshooting for real simple circuits. If you should
restore your high voltage, and the picture is fuzzy, replace the high
voltage rectifier tube located in the flyback housing.

If you're hell bent on getting a schematic, check local electronic houses
for Sam's schematics. More than likely you'll have to get tubes from
surplus houses too, since most tubes manufactured today are for audio
use. Probably be able to pick them up for 50 cents.  Good luck!

Bob "I was a teenage TV tech" Schwendel